Preparation of ZrB2 Nano-Powders by Novel Sol-Gel Technology
CHEN Ya-Lu, HUANG Zu-Bin, ZHANG Mei-Yu, CHEN Shuo, LI Min-Min, JI Hui-Ming
(Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education, School of Materials Science and Engineering,
Tianjin University, Tianjin 300072, China)
Abstract A stable and homogeneous Zr-B-C mixed sol system was obtained through sol-gel process using ZrOCl2, H3BO3 and sucrose as raw materials. Citric acid (CA) was adopted as complexing agent and polyethylene glycol (PEG600) was added in the system as dispersant. The transformation of sol to gel was achieved by adding ammonia water into the mixed sol drop by drop. Near-spherical ZrB2 particles with diameter of 40 nm were synthesized by carbonthermal reduction reaction at 1 500 ℃. XRD, SEM and other analysis methods were applied to study phase composition and microstructure of the nanoparticles as prepared. The effect of CA-complexation technology on the sol was also discussed in this paper. The results showed that stable Zr-B-C mixed sol system can be obtained when the molar ratio of Zr to CA is 3; pure and phase composition controllable ZrB2 powder can be prepared by increasing the molar ratio of B to Zr; dispersibility of the ZrB2 nanoparticles was better when 1.0%PEG was added.
CHEN Ya-Lu, HUANG Zu-Bin, ZHANG Mei-Yu, CHEN Shuo, LI Min-Min, JI Hui-Ming.Preparation of ZrB2 Nano-Powders by Novel Sol-Gel Technology[J] Chemcial Industry and Engineering, 2013,V30(5): 7-10
2013, Vol. 30 
